SARA-R4 series - System Integration Manual
UBX-16029218 - R06
System description
Page 14 of 102
1.4
Operating modes
SARA-R4 series modules have several operating modes. The operating modes are defined in Table 4 and
described in detail in Table 5, providing general guidelines for operation.
General Status
Operating Mode
Definition
Power-down
Not-Powered Mode
VCC
supply not present or below operating range: module is switched off.
Power-Off Mode
VCC
supply within operating range and module is switched off.
Normal Operation
Deep-Sleep Mode
RTC runs with 32 kHz reference internally generated.
Active Mode
Module processor core runs with 19.2 MHz reference generated by the internal oscillator
Connected Mode
RF Tx/Rx data connection enabled and processor core runs with 19.2 MHz reference.
Table 4: SARA-R4 series modules operating modes definition
Mode
Description
Transition between operating modes
Not-Powered
Module is switched off.
Application interfaces are not accessible.
When
VCC
supply is removed, the modules enter not-powered mode.
When in not-powered mode, the module can enter power-off mode
applying
VCC
supply (see 1.6.1).
Power-Off
Module is switched off: normal shutdown by an
appropriate power-off event (see 1.6.2).
Application interfaces are not accessible.
The modules enter power-off mode from active mode when the host
processor implements a proper switch-off procedure, by sending the
AT+CPWROFF command or by using the
PWR_ON
pin (see 1.6.2).
When in power-off mode, the modules can be switched on by the host
processor using the
PWR_ON
input pin (see 1.6.1).
When in power-off mode, the modules enter not-powered mode by
removing
VCC
supply.
Deep-Sleep
Only the internal 32 kHz reference is active.
The RF section and the application interfaces are
temporarily disabled and switched off: the
module is temporarily not ready to communicate
with an external device by means of the
application interfaces as configured to reduce
the current consumption.
The module enters the low power deep sleep
mode (entering the Power Saving Mode defined
in 3GPP Rel.13) whenever possible, if power
saving configuration is enabled by AT+CPSMS
command (see
SARA-R4 series AT Commands
Manual
[2]), reducing current consumption (see
1.13.9).
Power saving configuration is not enabled by
default; it can be enabled by AT+CPSMS (see
the
SARA-R4 series AT Commands Manual
The modules automatically switch from the active mode to low power
deep sleep mode whenever possible, upon expiration of “Active
Timer”, entering in the Power Saving Mode defined in 3GPP Rel.13, if
power saving configuration is enabled (see 1.13.9 and the
SARA-R4
series AT Commands Manual
[2], AT+CPSMS command).
When in low power deep sleep mode, the module switches on to the
active mode upon expiration of “Periodic Update Timer” according to
the Power Saving Mode defined in 3GPP Rel.13 (see 1.13.9 and the
SARA-R4 series AT Commands Manual
[2], AT+CPSMS command), or it
can be switched on to the active mode by the host processor using the
PWR_ON
input pin (see section 1.6.1).
Active
Module is switched on with application
interfaces enabled or not suspended: the
module is ready to communicate with an
external device by means of the application
interfaces unless power saving configuration is
enabled by AT+CPSMS (see
SARA-R4 series AT
Commands Manual
The modules enter active mode from power-off mode when the host
processor implements a proper switch-on procedure by using the
PWR_ON
pin (see 1.6.1).
The modules enter active mode from low power deep sleep mode
upon expiration of “Periodic Update Timer” (see 1.13.9), or when the
host processor implements a proper switch-on procedure by using the
PWR_ON
pin (see 1.6.1).
The modules enter power-off mode from active mode when the host
processor implements a proper switch-off procedure (see 1.6.2).
The modules automatically switch from active to low power deep sleep
mode whenever possible, if power saving is enabled (see 1.13.9).
The module switches from active to connected-mode when a RF Tx/Rx
data connection is initiated or when RF Tx/Rx activity is required due to
a connection previously initiated.
The module switches from connected to active mode when a RF Tx/Rx
data connection is terminated or suspended.
